Pre Calc

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From 2 points 400 yards apart on the bank of a straight river flowing due south, the bearings of a point on the opposite bank are 148 degrees and 28 degrees.

How wide is the river?

I am having a hard time understanding how this is set up.
Help please?

  • Pre Calc -

    my diagram looked like this :

    two vertical lines, points A and B 400 yards apart on the left line, with A above B.
    Point P on the other line, so that angle PBA = 28º and angle PAB = 32º (the supplementary angle to 180)

    now find the perpendicular distance from P to AB.
    Does that help?

  • Pre Calc -

    how do you find that? I have the angle measurments, but no side lengths.

    Except for 400..

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